Is older version of MIP SDK (e.g. 2017 R2) still available for download?

MIP
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2

The recommendation is to use the newest MIP SDK when developing. So the download is always the newest version.

If you have a special situation surrounding debugging a solution built with an older MIP SDK, or something similar, please contact Milestone Technical Support.

See -

https://developer.milestonesys.com/s/article/about-MIP-SDK-compatibility-with-XProtect-product-versions